Button for clothes

ABSTRACT

A button whose button body is prevented from tilting obliquely even when it is attached to clothes mechanically and which can be attached firmly to clothes. The button includes a button body  11 , and a leg portion  12  projecting in a ring shape downward to the bottom surface of the button body  11 , the leg portion  12  has a groove  17  formed therein for twining a thread  23  to be attached to clothes  2 , and the groove  17  has inclined surfaces  31  formed thereon an interval between which becomes narrower toward at least a tip. This structure prevents a knot portion of the thread from jumping out of the groove  17.

TECHNICAL FIELD

The present invention relates to a button for clothes which is attachedto clothes or the like and is used.

BACKGROUND ART

A button for clothes which is provided with a leg portion projecting ina ring shape downward to the bottom of the button body is usedconventionally. The button for clothes which has such a shape is calleda shank button or the like, and has the leg portion formed integral witha plate-like button body by drawing and molding a metal plate.

This button 6 for clothes is attached to clothes 7 by twining a thread63 in a leg portion 62 projecting from the bottom surface of a buttonbody 61, as shown in, for example FIG. 12( a). Generally, in twining thethread 63, the thread 63 is put through a button hole 64 formed in theleg portion 62 two to three times, wind thread shank (winding down) iscarried out, and finally root fastening is performed to form a knot.

In case of attaching the button for clothes to the clothes manually, thebutton can be pulled firmly and closely by power of a worker at the rootfastening stage, which advantageously provides firmly connection of thebutton and the clothing fabric, but the productivity is low, attachmenttime becomes longer, the manufacturing cost increases, and the yieldeventually becomes worse. This brings about a problem of obtainingsubstantially only about 20% of yield as compared with the case ofmechanical attachment. Since attachment of a button and root fasteningdiffers among workers, bringing about a problem that it is difficult tocontrol the quality of a product itself uniformly.

For the reason, especially in recent years, it is common to perform theattachment of a button to clothes using machinery, such as a sewingmachine. The method of attaching a button by machinery can improve theproductivity, shorten the working hours, reduce a difference in productquality and achieve uniform product quality at a low cost, and can alsoimprove the yield.

[Patent Document 1: microfilm in Japanese Utility Model Application No.Sho 56-91938 (Japanese Unexamined Utility Model Publication No. Sho57-203811)]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

However, at the time of carrying out mechanical attachment of a button,there is no pulling by a worker at the stage of the root fastening, sothat particularly, a leg portion and a knot of a thread cannot be firmlyfixed. Therefore, in the explanation of an example shown in FIG. 12,even if a button 6 for clothes is attached to clothes 7, a knot of thethread 63 slides on a leg portion 62, and a button body 61 tilts aslantas shown in, for example, FIG. 12( b). Because of the loose knot, evenif attachment is carried out at the time of mechanical attachment insuch a way that the knot is located in the center of the leg portion 62,the knot will gradually shift from the center of the leg portion 62 toan end portion by subsequent uses of the button, and the button body 61will tilt aslant eventually. This brings about a problem that thedetails of the buttons 6 in the general diagram of the clothes 7 asshown in, for example, FIG. 13( a), is such that the tilted buttons 6for clothes become notable as shown in FIGS. 13( b) and 13(c), makingthe appearance very poor. In case of forming a so-called ornament buttonhaving an ornament, such as a shape or pattern, made thereto, inparticular, the button body 61 becomes heavy, and tilts immediately, sothat the expected effect of the ornament cannot be obtained,disadvantageously.

There is a problem that when a knot 66 of the thread 63 is shifted fromthe center of the leg portion 62 to an end portion, the thread 63 isworn against the leg portion 62 by friction, so that it is likely thateventually, the thread 63 is snapped and the button 6 for clothes comesoff the clothes 7 as shown in FIG. 12( c). Further, while the button forclothes stands upright immediately after it is fixed to the clothes, theuprightness may be gradually spoiled through multiple use of the button.In this respect, recently, there is a growing demand for clothes towhich buttons that can maintain uprightness for a long period of timeare fixed.

Accordingly, the present invention has been made in view of theaforementioned problems, and it is an object of the invention to providea button for clothes and clothes, which can keep the uprightness of thebutton for clothes for a long period of time.

Means for Solving the Problems

To solve the foregoing problems, the present inventor has invented abutton for clothes and clothes which has a groove formed in a legportion and has the button attached to the clothes by twining a threadin the groove, thus preventing a knot portion from jumping out of thegroove.

Namely, a button for clothes to which the invention is adapted ischaracterized by having a button body, and a leg portion projecting in aring shape downward to a bottom surface of the button body, the legportion having a groove formed therein for twining a thread to beattached to clothes, the groove having inclined surfaces formed thereonan interval between which becomes narrower toward at least a tip.

EFFECT OF THE INVENTION

According to the button for clothes to which the invention is adapted,the groove for twining a thread to be attached to clothes is formed inthe leg portion projecting in a ring shape downward to the bottomsurface of the button body.

Attaching the thus structured button for clothes to the clothes bytwining a thread to the groove can prevent a knot portion of the threadfrom jumping out of the groove and further can prevent the knot portionof the thread from sliding on the leg portion to the end portion. As aresult, it is possible to prevent the button body of the button forclothes from tilting aslant, so that the button can be fixed upright tothe clothing fabric of the clothes.

BEST MODE FOR CARRYING OUT THE INVENTION

A button for clothes which is attached to clothes or the like to be usedas the best mode for carrying out the invention will be explained indetail below referring to the accompanying drawings.

FIG. 1( a) shows a rear view of a button 1 for clothes to which theinvention is adapted, FIG. 1( b) shows a side view of the button 1 forclothes, and FIG. 1( c) shows a perspective view of the button 1 forclothes.

The button 1 for clothes has a button body 11, a leg portion 12projecting in a ring shape downward to a bottom surface 11 a of thebutton body 11.

The button body 11 and leg portion 12 may be formed integrally bydrawing and molding a metal plate, or may be formed of a resinintegrally. They may be formed of any other materials than a metal andresin.

The leg portion 12 may be formed in any shape as long as it is a ringshape, or may be made into a polygonal shape which has any number ofcorners, or may be made into a semi-elliptical or semicircular shape. Itmay be formed into a U shape. That is, as long as a ring for forming ahole in which a thread is inserted is formed, the leg portion 12 may bemade in any shape.

That is, the leg portion 12 may have a corner portion bent byapproximately 90° or may not have the corner portion and may begradually bent with a curvature. In case of bending the leg portion 12with a curvature, the curvature may have any radius of curvature.

Both the end portions of the leg portion 12 are shaped to enter thebottom surface 11 a of the button body 11 from the bottom side. On theother hand, a center portion 21 of the leg portion 12 extendsapproximately in the horizontal direction. If the leg portion 12 isformed into a semi-elliptical or semicircular shape, the center portion21 likewise has a bent shape of projecting downward. Although the legportion 12 has the shape of a flat plate bent in a ring shape, which isnot restrictive, and it may be formed to have any sectional shape.

There is a button hole 14 inside the leg portion 12. The button hole 14may be formed to have any shape or a polygonal shape having any numberof corners, or may have a semi-elliptical or semicircular shape. Thesize of the button hole 14 is determined based on the standard inmechanical attachment by a sewing machine or the like, and is desirableto be set to have φ of 1.5 mm or greater. The center portion 21 of theleg portion 12 is surrounded by a bottom surface 12 a, a top surface 12b, a side surface 12 c, and a side surface 12 d, as shown in FIGS. 1( a)and 1(b).

In the button 1 for clothes to which the invention is adapted, thegroove 17 is formed in at least one of the bottom surface 12 a, the topsurface 12 b, the side surface 12 c, and the side surface 12 d.

In the example of FIG. 1, the groove 17 is formed in both side surfaces(side surface 12 c, side surface 12 d) at the center portion 21 of theleg portion 12. FIG. 2 is an enlarged structural diagram of the groove17. The groove 17 has inclined surfaces 31 formed thereon an intervalbetween which becomes narrower toward at least a tip 32. The inclinedsurface 31 may have a flat surface as shown in FIGS. 2( a) and 2(b),which is not restrictive, and may have a curved surface which has aslight curvature as shown in FIGS. 2( c) and 2(d). The tip 32 of thegroove 17 may be rounded as shown in FIGS. 2( a) and 2(c), or may besharpened as shown in FIGS. 2( b) and 2(d).

That is, the groove 17 may be formed to have any shape as long as theshape of the groove 17 has the inclined surfaces 31 which are indicatedby the solid lines in FIG. 2 and an interval between which becomesnarrower toward at least the tip.

FIG. 3 shows an example in which the groove 17 is formed to have anapproximately pentagonal sectional shape sharpened in the depthdirection. Since the groove 17 having the approximately pentagonalsectional shape also has the inclined surfaces 31, it is included in thecategory of the aforementioned technical concept.

In this connection, the groove 17 may be formed into an approximately npolygonal sectional shape as long as it has the inclined surfaces 31 aninterval between which becomes narrower toward at least the tip (n beingan integer of 3 or greater).

FIG. 4 shows the case where the button 1 for clothes which has theforegoing structure is attached to clothes 2. The button 1 for clothesis actually attached to the clothes 2 by twining the thread 23 aroundthe grooves 17. Generally, in twining the thread 23, the thread 23 isput through the button hole 14 formed in the leg portion 12 two to threetimes or more. At this time, in the button 1 for clothes to which theinvention is adapted, the groove 17 is formed in the center portion 21of the leg portion 12 beforehand, the thread 23 can be twined around thegrooves 17 by inserting the thread 23 in the button hole 14. As aresult, after the thread 23 is wound in the grooves 17, wind threadshank (winding down) is carried out, and finally root fastening isperformed.

The button 1 for clothes attached to the clothes 2 this way has thethread 23 wound around the grooves 17. In other words, the knot portionof the thread 23 is located in the grooves 17. This prevents the knotportion of the thread 23 from jumping out of the grooves 17, and furtherprevents the knot portion of the thread 23 from sliding on the legportion 62 to that end portion. As a result, it is possible to preventthe button body 11 of the button 1 for clothes from tilting aslant, sothat the button can be fixed upright to the clothing fabric of theclothes 2.

If the button 1 for clothes is mechanically attached, even when the knotstrength of the thread is looser than that in the case of manualattachment, the existence of the grooves 17 can prevent the knot portionof the thread 23 from jumping out of the grooves 17.

After attaching the button 1 for clothes, load of the tensile force andthe torque will be applied to the button 1 for clothes by the subsequentuses of the button. However, even with such force being applied, theknot portion of the thread 23 can be prevented from jumping out of thegrooves 17 by twining the thread 23 around the grooves 17 and fixing itin the present invention. That is, in the present invention, onceattached to the clothes 2, the button does not tilt slant even throughthe subsequent uses thereof, and can always be set upright to theclothing fabric of the clothes 2.

When the clothes 2 entirely has the buttons 1 for clothes to which theinvention is adapted, the buttons 1 for clothes which are upright evenfor the entire clothes 2 can overcome the problem of making theappearance poorer. In particular, in a case where the buttons 1 forclothes is formed as a so-called ornament button having an ornament,such as a shape or pattern, made thereto, even when the button body 11becomes heavy, the button can be prevented from tilting aslant, so thatthe expected effect of the ornament can be obtained.

Further, in the buttons 1 for clothes to which the invention is adapted,a knot of the thread 23 does not shift from the center of the legportion 12 to the end portion, so that the thread 23 is not worn againstthe leg portion 12 by friction. This can prevent the thread 23 frombeing snapped so that the button 6 for clothes does not come off theclothes 2. Therefore, the present invention can prevent the buttons 1for clothes from coming off the clothes 2 even through their long usageand keep the firmly attached state.

Particularly, the present invention requires that the groove 17 shouldhave the inclined surfaces 31 an interval between which becomes narrowertoward at least the tip 32. At the time of twining the thread to such agroove 17, the thread 23 is guided toward the tips of the groove 17 viathe inclined surfaces 31. As a result, the force of fastening to thegroove 17 by the thread 23 can be centralized concentrated at the tip ofthe groove 17, thus preventing an increase in slacking of the thread 23caused by the temporal use of the button, and eventually, lack of theuprightness. It is possible to improve the prevention of the thread 23from coming off the groove 17 by employing the structure where a sharptip portion is formed at the groove 17 to ensure spreading sidewaysthrough the inclined surfaces 31.

In the groove 17, as shown, for example, in FIGS. 2( b) and 2(d), bysharpening the tip of the groove 17, the fastening force of the thread23 guided via the inclined surfaces 31 to the tip can be concentrated onthe tip portion, making it possible to stably demonstrate theuprightness of the button for a longer period of time.

The present invention demonstrates a significant effect when a button isattached to the clothes 2 by mechanical attachment. By attaching abutton by mechanical attachment, it is possible to improve theproductivity, shorten the working hours, reduce a difference in productquality and achieve uniform product quality at a low cost, and alsoimprove the yield. In addition, the present invention can overcome theproblem of tilting of a button at the time of carrying out mechanicalattachment, and can keep the upright state. This makes it possible toset a button firmly upright as done in the case of manual attachment,thus providing a better appearance, while improving the yield, so that asignificant effect is brought about synergistically.

In order to hold a button in the upright state, the number of turns ofthe thread 23 to the grooves 17 is determined based on the sectionalshape, the width and the thickness of the leg portion 12, and the shapeand size of the grooves 17. Conversely, the shape and size of thegrooves 17 may be adjusted beforehand based on a predetermined number ofturns of the thread 23.

FIGS. 4( a), 4(b), and 4(c) show a button 1′ for clothes as otherstructural examples of the button 1 for clothes. As the same referencenumerals are given to the same components and members of the button 1′for clothes as those of the structural example of FIG. 1, the foregoingdescription is given by reference and will be omitted hereinbelow.

In the button 1′ for clothes, the groove 17 is formed in the top surface12 b at the center portion 21 of the leg portion 12. That is, the groove17 is formed in three surfaces, the top surface 12 b in addition to bothside surfaces 12 c and 12 d of the center portion 21. As a result, sincethe thread 23 can be wound about in the grooves 17 formed in the threesurfaces at the time of twining the thread 23, the knot portion of thethread 23 can be fixed more stably and jumping of the knot portion ofthe thread 23 off the grooves 17 can be prevented more firmly ascompared with the case of the button 1 for clothes in which the thread23 is wound about in the grooves 17 formed in the two surfaces. As aresult, the button 1′ for clothes can be set upright to the clothes 2 ina more stable state.

Although the foregoing description of the invention has been given ofthe case where the grooves 17 are provided in the center portion 21 ofthe leg portion 12, it is not restrictive, and a projection may beprovided in place of the groove 17. That is, if at least two projectionsare provided in the center portion 21 of the leg portion 12, a threadcan be wound about between the projections in a twined manner, so thatan effect substantially the same as that in the case of providing thegrooves 17 can be expected.

The individual shapes of the button for clothes were classified into A-1to A-4, B-1 to B-5, C-1 to C-3, and D-1 to D-4 as shown in FIGS. 6 to 9.

In the figures shown in FIGS. 6( a), 6(b), FIGS. 7( a), 7(b), 7(c), FIG.8( a), and FIG. 9( a), the dotted lines show portions specified in A-1to D-4. FIG. 6( c), FIG. 7( d), FIG. 8( b), and FIG. 9( b) enumerate theshapes of individual parts of the button.

A-1 corresponding to FIG. 6( a) enumerates examples of the shapes of thebutton hole 14. A-2 to A-4 corresponding to FIG. 6( b) enumerateexamples of the groove 17 or projection formed at the top surface 12 b.B-1 corresponding to FIG. 7( a) enumerates examples of the outer shapeof the leg portion 12. B-2 to B-4 corresponding to FIG. 7( b) enumerateexamples of the groove 17 or projection formed at the bottom surface 12a. B-5 corresponding to FIG. 7( c) enumerates shapes of the groove 17 orprojection formed at the bottom surface 12 a or the top surface 12 b asseen from the front side. C-1 to C-4 corresponding to FIG. 8( a)enumerate examples of the groove 17 or the projection formed at the sidesurface 12 c. D-1 to D-4 corresponding to FIG. 9( a) enumerate examplesof the groove 17 or projection formed at the side surface 12 d.

Since the shape of the leg portion 12 is made by A-1 and B-1, it isessential to select any one structure from A-1 and B-1. In addition,according to the present invention, any one structure or more areselected from A-2 to A-4, B-2 to B-4, C-1 to C-4, and D-1 to D-4. Inother words, it is possible to employ a structure in which the groove 17or projection should be provided in all of the bottom surface 12 a, thetop surface 12 b, and the side surfaces 12 c, 12 d of the leg portion 12by employing one structure from any of A-2 to A-4, B-2 to B-4, C-1 toC-4, and D-1 to D-4.

A-4, B-4, C-4, and D-4 are examples in which a projection is provided atboth sides of the groove 17. If the knot portion of the thread 23 istwined in the groove 17, sliding of the knot portion of the thread 23can be prevented by the projections in addition to the groove 17, thusmaking it possible to further enhance the effect of the invention.

EXAMPLE 1

In order to check the effect mentioned above, empirical studies to beexplained below were made. The button 1 for clothes to which theinvention was adapted was attached to the clothing fabric based on theabove-described process. As comparative examples, a conventional buttonwhich had the same button body 11 as the button 1 for clothes and wasnot provided with the groove 17 was attached to a clothing fabricmechanically and manually.

Next, a reversal torsion test and an up-and-down vertical tensile testwere performed on these buttons. In the reversal torsion test, thebutton was twisted by 180° at a speed of about 200 times per minutewhile pulling the clothing fabric with a load of 60 gf applied to theforward and behind the clothing fabric having the button attachedthereto. The reversal torsion test was conducted 10000 times per button.In the up-and-down vertical tensile test, an upward hook was put on thearched leg portion with a load of 120 gf applied to the arched legportion, and was pulled upward until a load of 400 gf was applied. Thisup-and-down vertical tensile test was conducted 100 times per button.

As a result, even through the reversal torsion test, and through anup-and-down vertical tensile test, the direction of the button 1 forclothes to which the invention was adapted was stably upright before andafter the test, and the button appeared nice.

By way of comparison, the directions of the buttons of the comparativeexamples of the mechanical attachment and the manual attachment weretilted through the reversal torsion test, and through the up-and-downvertical tensile test.

EXAMPLE 2

In order to check the effect mentioned above, empirical studies to beexplained below were made. The button 1 for clothes to which theinvention was adapted was attached to the clothing fabric based on theabove-described process. As comparative examples, a conventional buttonwhich had the same button body 11 as the button 1 for clothes and wasnot provided with the groove 17 was attached to a clothing fabricmechanically and manually.

Next, these buttons were pressed from above. As a result, as shown inFIG. 10( a), a peak 11 b of the button body 11 which faced substantiallyin the vertical direction at the beginning was tilted by about 40°.

Next, with this state being 0°, the pressure was released. As a result,the button body 11 was returned to the original position, and the returnangle θ (°) was measured. That is, the return angle θ is based on thestate (0°) where the end portion of the button body 11 is in contactwith the clothing fabric. The measurement was carried out in twopatterns: the case where pressure was applied to cause inclination inthe A direction and the case where pressure was applied to causeinclination in the B direction as shown in FIG. 10( b). The A directionindicates a direction perpendicular to the lengthwise direction of theleg portion 12, and the B direction indicates a direction parallel tothe lengthwise direction of the leg portion 12. The measurement wascarried out 8 times for each of different samples, and an average of themeasurements was taken finally.

The measurement results of the return angle θ are shown in Table 1.

TABLE 1 Measurement Average 1 2 3 4 5 6 7 8 Examples of A direction 30.730 40 30 40 25 20 25 35 invention B direction 28.8 30 20 35 35 35 20 2035 Prior art A direction 4.4 0 5 0 10 0 10 10 0 (mechanical B direction3.2 0 5 0 10 5 5 0 0 attachment) Prior art A direction 6.5 0 5 0 5 2 1515 10 (manual B direction 1.9 0 0 0 0 0 5 0 10 attachment) Note 1) Allunits are °. Note 2) Rounded off at the second decimal point.

The return ratio calculated from the return angle θ of the button body11 is shown in the following Table 2. The return ratio shows in percenthow many degrees the end portion of the button body 11 returns towardsthe original position based on the state (0°) where the end portion ofthe button body 11 is in contact with the clothing fabric. That is, thereturn ratio can be shown as the return angle θ/40×100(%).

TABLE 2 Measurement Average 1 2 3 4 5 6 7 8 Examples of A direction 76.475 100 75 100 62 50 62 87 invention B direction 71.7 75 50 87 87 87 5050 87 Prior art A direction 11.0 0 12.5 0 25 0 25 25 0 (mechanical Bdirection 7.9 0 12.5 0 25 12.5 12.5 0 0 attachment) Prior art Adirection 16.3 0 12.5 0 12.5 5 37.5 37.5 25 (manual B direction 4.7 0 00 0 0 12.5 0 25 attachment) Note 1) All units are °. Note 2) Rounded offat the second decimal point.

The results of the Tables 1 and 2 show that the return angles θ of thebutton body 11 were larger in the examples of the invention than thosein the comparative examples. Likewise, the examples of the invention hada greater return ratio than the comparative examples. That is, it can besaid that working of the above-described mechanism in the examples ofthe invention supports that the force of returning to the originalposition acts greatly. In other words, in the invention, even withpressure being applied to the button body 11, the upright state can bemaintained.

EXAMPLE 3

FIG. 11 shows a structural example of the back of the leg portion 12 ofthe button 1 for clothes to which the present invention is adapted. Inthis example, the groove 17 is formed in both side surfaces (sidesurface 12 c, side surface 12 d) of the leg portion 12. In the exampleof FIG. 11, the groove 17 is formed into an approximately pentagonalcross-sectional shape. In the example of FIG. 11, the groove 17 isstructured to have a width t₁ of about 0.8 mm and a depth t₂ of about0.7 mm, and to be sharpened by about 0.2 mm in depth t₃ in the depthdirection.

In the example of FIG. 11, the thread 23 is twined at the sharp tipportion of the groove 17 first, and is then twined to spread on bothsides of the sharp tip portion as the number of turns is increased. As aresult, the fastening force to the groove 17 by the thread 23 can beconcentrated on the sharp tip portion, making it possible to preventslacking of the thread 23 from increasing by the temporal use of thebutton, and eventually prevent lack of the uprightness. It is possibleto improve the prevention of the thread 23 from coming off the groove 17by employing the structure where a sharp tip portion is formed at thegroove 17 to ensure spreading sideways.

It is desirable that in the example of FIG. 11, the angle φ of theillustrated sharpened surface to the level surface should be set to 10to 70°. This is because if the angle φ is 10° or less, the fasteningforce of the thread to the groove 17 cannot be demonstrated, whereas ifthe angle φ exceeds 70°, the sharp tip portion becomes sharper so thatthe twined thread 23 is worn off. Note that the angle φ is desirably ina range of 30 to 60° from the viewpoint of preventing the wearing off ofthe thread 23 more firmly and further improving the concentration of thefastening force.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 A structural diagram of a button for clothes to which the presentinvention is adapted.

FIG. 2 An enlarged structural diagram of a groove in the button forclothes to which the present invention is adapted.

FIG. 3 An example where a groove in the button for clothes to which thepresent invention is adapted is formed in an approximately pentagonalcross-sectional shape.

FIG. 4 A diagram showing an example where the button for clothes towhich the present invention is adapted is attached to clothes.

FIG. 5 A diagram showing another structural example of the button forclothes to which the present invention is adapted.

FIG. 6 A first diagram which enumerates the shapes of individual partsof the button for clothes to which the present invention is adapted.

FIG. 7 A second diagram which enumerates the shapes of individual partsof the button for clothes to which the present invention is adapted.

FIG. 8 A third diagram which enumerates the shapes of individual partsof the button for clothes to which the present invention is adapted.

FIG. 9 A fourth diagram which enumerates the shapes of individual partsof the button for clothes to which the present invention is adapted.

FIG. 10 A diagram for explaining an example of the button for clothes towhich the present invention is adapted.

FIG. 11 A diagram showing a structural example of the back of a legportion of the button for clothes to which the present invention isadapted.

FIG. 12 A diagram for explaining the problems of the conventional art.

FIG. 13 Another diagram for explaining the problems of the conventionalart.

DESCRIPTION OF NOTATIONS

-   1 button for clothes-   2 clothes-   11 button body-   12 leg portion-   17 groove-   21 center portion-   23 thread

1. A button for clothes characterized by having: a button body; and aleg portion projecting in a ring shape downward to a bottom surface ofthe button body, the leg portion having a groove formed therein fortwining a thread to be attached to clothes, the groove having inclinedsurfaces formed thereon an interval between which becomes narrowertoward at least a tip.
 2. The button for clothes according to claim 1,wherein the inclined surfaces are curved surfaces or flat surfaces. 3.The button for clothes according to claim 1 or 2, wherein the tip of thegroove is sharpened or is rounded.
 4. The button for clothes accordingto any one of claims 1 to 3, wherein an angle φ of the inclined surfacesto a horizontal plane is 10 to 70°.
 5. The button for clothes accordingto any one of claims 1 to 4, wherein the groove is formed with anapproximately n polygonal shape (n being an integer of 3 or greater). 6.The button for clothes according to claim 1, wherein the groove isformed with an approximately pentagonal shape to be sharpened in a depthdirection, and an angle φ of the inclined surfaces to a horizontal planeis 10 to
 700. 7. The button for clothes according to any one of claims 1to 6, wherein the groove of the leg portion is formed by one sidesurface or both side surfaces.
 8. The button for clothes according toany one of claims 1 to 7, wherein the leg portion is provided with thegroove formed by a bottom surface.
 9. The button for clothes accordingto any one of claims 1 to 8, wherein the leg portion is provided withthe groove formed by a top surface.
 10. Clothes to which the button forclothes according to any one of claims 1 to 9 is attached.